Fluid compressor



Nail?, 1931. E,w sON Y Re; 18,251

FLUID COMPRESSOR 5 Sheets-Sheet 2 Original Filed May 7. 1918 INVENTOR MR WILSON BVMW@ )1f/,5' ATTORNEYS.

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v IN VEN TOR 50M/A /P M1, soa/v //AS' ATTORNEYS.

Nom-17, 1931. l wlLsON Re. 18,251 v `FLUID COMPRESSOR l original Filed may 7.' 191B 5 sheets-sheet 4 VENTOR E. WILSON FLUID COMPRESSOR Nov. 17, 1931.

Original Filed May 7. 1918 5 'Shets-Sheet 5 INVENTOR i EDM/P0 W/LSO/V BY w 'Reiseued Nov. 1,7, 1931 TEs PATENT oF FICE EDWARD WILSON, OF BT. LOUIS, MISSOURI FLUID COMPRESSOR original No. 1,835,522, dated July 12,` 1927, Serial No. 233,040, tiled May 7, 1918. Application for rellene med September 25, 1930. Serial'No. 484,459.

cylinder, and to prevent leakage into the compression space. Second, to reduce 'friction and wear of the moving parts to a mmimum. Third, to provide thorough lubrication of the moving surfaces. Fourth, to mmimize the heating effect of compression upon the Walls of the compressor cylinder by drawing the supply of liuid through a section of the hollow shaft into the compressionspace and discharging the fluid after compression through another section of the hollow shaft into a cooler, and causing it to pass through the housing surrounding the cylinder on its course to a storage tank. Fifth, to produce a rotary compressor of few parts, simple in construction and easily assembled, Sixth, to produce a rotary compressor from which the fluid is discharged with uniform. flow and without pulsation.l Seventh, to produce a rotary compressor having a housing arranged to contain oil and to function as an oil reservoir and to hold liuid under pressure, and including means to utilize the oil to lubricate parts of the compressor and to seal the compressor to prevent leakage of the fluid under pressure into the compressor.

In the drawings- Fig. 1 is a longitudinal sectional View of ymy device.

. Fig. 2 is an end 'View with the housing head removed and part of the 'shaft in section lookin in the direction of the arrow in Fig. 1.

Fig. 3 is across section on the line 3-3 of Fig. 4 is an enlarged end view of the rotor. Fig. 5 is a side View of the eccentric member or casing supporting the compression cylinder.

' Fig. 6 is a perspective view of the rotor piston.

Fig. 7 is a diagrammatic view showing thev manner of eccentrically mounting the cylinder.

Fig. 8 is an enlarged section of rotorand cylinder taken on line 8 8 of Fig. 1.

Fig. 9 is a side view of rotor showing relative position of ports in rotor and the rotor piston.

Fig' 10 is a top plan view of my invention, more specifically. bringing out the construction by means of which the heat of compression around the compression cylinder is eliminated.

Fig. 11 is a detail view of a the rotor piston.

Fig. 12 is a detail view of another portion of the rotor piston.

Referring to the drawings, 11 indicates a. housing, to which isattached heads 12 and 13. Attached to head 12 is a packing box 14, within which is a acking 15, surrounding 'the discharge end of shaft 16. Packing 15 is adjusted by spring actuated gland 17 and spring 18, which is compressed by means of cap 19 and nut 20, which is screwed on to packing box 14. Cap 19 has a discharge pipe connection 21 leading to any suitable cooling coil or device 22. (See Fig. 10. On hea 12 is a pipe connection 22', whlch leads to any suitable storage tank or reservoir for the compressed iuid.V

On housing 11 is a boss 23, to which is attached the pipe 24 returning from the cooler. (See Fig. 10.) To the head 13 is attached an elongated packing box 25, which is provided with an intake pipe 26 communicating with its interior directly below the intake pipe, and Within the bore of the packing box` is placed a split spring control gland 27,

Vwhich' is forced apart by means of the coil spring 28. This gland isprovided with openings 29, which allow the air to enter bore 30 of shaft 16 through openings 3l.- The air thus admitted, passes vinto the opening 32 formed in the rotor 33, and thence into the compression chamber 34. This compression chamber 34 is formed between the rotary cylinder 35, rotor 33 and the floating heads 36, the rotary cylinder being mounted in member 37 on ball bearings 38 in an eccentric relationA to rotor 33 and in contact therewith at point 39. Eccentric member 37 sup orting c linder is likewise mounted in earings of housing 11 in an eccentric relation to cylinder 35. This eccentric shape of memportion of ber 37 is for the purpose vof maintaining a` contact at oint 39 between rotor 33 and cylinder 35, ue to the turning effort of spring the action of spring 28, at the same time b aowing the .air to enter the bore of shaft On each end of the rotor 33, I provide the spring actuated members or floating heads 36 provided with elastic packin rings 36". These members or floating hea s 36,'at the beginning of the operation of the compressor are lightly held in contact with the ends of the rotor by means of the coil springs 49.

vAs the operation continues, and the compressed air reaches the casing or housing 11 the uid pressure accumulated within sai .A withoutthe springs,

casing or housing 11 exerts sutlicient pressure,

to maintain'a fluid ti ht 'contact with the ends of the rotor. In ot er the casing or springs.

Words, after the com ressor has been running, there will be su cient fluid pressure in.

housing 11 to maintain the floatiluid tight contact with the ends the action of the These springs', however, in so far as they perform a necessary function, are one of the features of my improvement.

The fluid ltight contact between the rotor 33 and the com ression cylinder 35 at point 39 is maintaine by, means of the coil spring 40'acting to rotateA eccentric member or casin 37. The pressure of spring 40 is regulateday means of the adjusting screw 50, which is locked by means of the cap 51.

The housin 11 is provided with-an inte` gral base section 52, the bottom of which is closed by the base plate 53, and the section 52 is further sup lied with pipes 454and 55 when it is desired) to water. cool the housing 11. y

The housing. 11 is provided with an oil drain 56 in its bottom and an oil suppllly 1port 57 in its upper portion or top, the o' e being shown in Figs. 1 and 2. The oil is conveyed to the several bearings by the rings 58 placed over the shaft 16 an dipping into the oil.

The rotor 33 is provided with flanges 59 at both ends and a longitudinal slot or pocket ing heads in of the rotor, without 60, in which the rotor 'piston 61 is located.

The rotor piston 61 is com osed of the section 62, which is the full wi th of the rotor,

vel

and the two sections 63. (See Fig. 6.) The sections 63 have a combined width slightly less than section 62, the object of which is, that compressed air entering the space 64 between the sections will have a tendenc to force them apart and make a fluidt-ight ]oint between them and the heads 36 of' the compression chamber. The idea of making the rotor piston out of sections, and providinv'- .between the sections, a space for compresse air, so that they may be adjusted by means of air pressure, I regard as another specialfeature of my improvement.

By reference to Figs. 6, 8 and l1 it will be observed that the section 62 is slightly trapered, andhas its forward edges slightly curved, the object of which is to prevent the same from wedging or binding in its movement. It will be observed, however, that the rounded edges are overlapped by the sections 63. The section 62 of the piston is formed with a -port 62'* which admitsoil and pressure from the compression chamber into the space behind or .beyond tl-ie rear edge of the piston. This pressure that is admit-ted bchind the piston blade cooperates with centrifugal energy in the o eration of the machine to holdtlie outer e ge of the blade in continuous contact with the inner periphery of the v cylinder.

After the chamber 34, it passes through poppet valves 65, thence through port 66, thence through port 67 of shaft 16; ports 66 and valves 65 eing located in the rotor forward and close to rotor piston 61. Afterleaving the shaft housingll at point 23, and finally through pipe 22 to a suitable storage tank or reservoir. It-Will be noted that suction bore 30 and discharge port 67l of shaft 16 are separated by a wall 68.

The pressure of the spring 40 is excited on the lug 69 formed on one side of the ecceutric member or casingv 37, and has a tendency to turnthe same. Y By referring to Fig. 7, point A represents the center of rotation for the shaft 16 and rotor 33, as well as the center from which the outer circumference of the housing 11 is struck, the point B the center around which the compression cylinder 35 revolves, and point C the center from which the bearings D or the eccentric member 37 are struck. (See Figs. 1 and 3.)

air has been compressed in the It will be observed from the foregoing -On the inside of each oating head 36 there is a space or chamber 69 formed in the ends of the rotor, b means of which the pressure on each side o the I ioating heads is partially equalized. (See Figs. 1 and 4.) In the rotor pocket 60 (see Fi 8) there 1s also a small chamber or space O for compressed air, by means of which the pressure on each side of the rotor piston 61 lis `partially equallzed:

As previously pointed out, in operation, when the compressor has started, the sprmgs 49 will vmaintain a fluid tight joint between the rotor and floating heads 36, but when pressure has been accumulated in the hous'mg 1 1, the fluid pressure therein will be suflic1ent to maintain a fluid tight joint without the s rings,between the ends of the rotor and t e floating heads 36. In practical operation, the fluid pressure accumulated within the housing 1l, acting on the floating heads 36, will maintain a fluid ti v ht joint between said heads and the ends of t e rotor. The idea of maintaining the heads 36 in fluid tight contact with the ends of the rotor, by means of fluid pressure generated within Vthe compressor and accumulated within the housing 11 of the compressor, together with the pressure equalization of the heads, as previously pointed out, is one of the characteristie features of my improvement. U

As previously mentioned, the rotor 33 1s I' held in fluid tight contact withthe cylinder 35 by means of the spring 40 actingon the eccentric member or casing 37. The eccentric member or casing 37 is laterally adjustable relative to the rotor 33and the shaft 16, and consequently the compression cylinder 35, being mounted or carried on said member 37, is therefore laterally adjustable relative to said shaft and the rotor mounted thereon. r

By the rotation of the eccentric member or casing 37 through the'agency ofspring 40, or by any other instrumentality, the compression cylinder 35 is adjusted laterally against the rotor. This adjustment is automatic in its action, and compensates for an wear bej tween the compression cylinder an the rotor.

This lateral adjustability of the compressio'n cylinder, relative to the'rotor, constitutes another characteristic feature' of my improvement;

My compressor is operated preferably by direct connection to a motor shaft 44 by any flexible coupling. The rotation of the motor produces rotation of shaft 16 and rotor 33, which is rigidlymounted on said shaft. During this operation, rotor piston 61 sweeps through compression-chamber 34, causing air to be taken vinto said chamber 34'through the bore 30`of the hollow shaft16, through port 3.2 into said chamber at the rear or behind piston 61. .At the same time, air in front of the pistonn in chamber 34 is being compressed, and is ultimately forced out through discharge valve 65, thence through port 66 into hole 67 of shaft 16,.thence into cap 19 and through pipe 21'into the cooling coil 22, and then returns through pipe 24 into the chamber of the housing 11 at point 23, and thence through pipe 22 to a suitable air tank or receiver. It will be thus seen that the compressed air passing through the cooler 22, gives up the heat of compression, and in its return passa e through the housmg surrounding the cy inder 35, absorbs the heat o compression from the cylinder walls.

During this operation, cylinder 35, being in frictional contact with the revolving rotor at point 39, revolves therewith on cylinder bearings 38.' This causes a low surface speed between the elements forming the compression cylinder and the elements of the rotor, with consequent reduction of friction between the moving surfaces thereof.

It will be understood that during the com pression, the position yof the .compression chamber 34 is not changed, notwithstanding the fact that all the surfaces thereof are moving,and the rotor piston 61 sweeps throu h this chamber just as it would if the cylin er were stationary. The rotor piston 61, during this operation, under the influence of centrifugal force, is continually held out a ainst the wall of the cylinder 35, and is orced back into the piston pocket 60 as it a preaches the rolling contact 39. It will he observed, as --previouslymentioned, that the compression chamber 1sl formed between the 95 lheads 36.

A fluid tight joint is maintained at point` 39 by the action of spring 40, which tends to turnfeccentrio casing 37 in itsbearings D in housing 1p1. This action, by virtue of the eccentricity of this -member with relation to cylinder 35, tends to move the cylinder laterally against the rotor 33, due to the fact that the thin side of eccentric member 37 or the portion adjacent to the spring abutment is ad'acent to point 39. (See Figs.`3 and 7.)

luid tight joints are-also maintained at the ends of rotor 33 by floating heads 36,

-which are initially held in contact with flanges 59 of the rotor by theaction of springs 49. It will be understood, as previously mentioned, that springs 49 exert, at the beginning of compression, only slight pressure, and When air has been compressed in the chamber of housing 11 tofan appreciable amount, it acts in conjunction with springs 49 to maintain this fluid tight contact between heads 36 and flanges 59 of rotor 33.

It will be understood that the action of these forces upon the` floating heads 36 tends to produce a clamping effect upon the rotor 33, and this would be very great if some means were not provided for reducing this action toa minimum. This is accomplished byreducing the unbalanced area. against which ghe-pressure acts, as shownmore clearly in By referring to Fig. 4, it will be noted that the metal at the ends of rotor 33 is removed v ing 11, to

by routing, to orm the chambers 69", and leaving a comparatively narrow flange 59` around the periphery of the rotor and the rotor piston slot or pocket 60. By ormin these chambers or cavities 69,.by the remova of metal from the ends of rotor, air is permitted, under the pressure existing in housenter said cavities or chambers 69 between the ends of rotor 33 and heads 36, thereby partially equaliziug the pressure acting upon these heads, and reducing the friction load accordingly.

A s previously pointed out, the rotor piston 61 is forced outwardly against the cylinder wall 35 by centrifugal action and the pressure that is admitted to the rear of said piston as above-described, and inwardly by virtue of the eccentric mounting of the compression cylinder relative to the rotor. In operation, the pressure in front of the rotor piston, it will be understood, is far in excess of that in the rear, whichhas a tendency to prevent the operation of the rotor piston in its pocket by virtue of the friction produced between the rotor piston and the rear wall of the piston pocket. In order to overcome this, I have formed in the rear of the rotor piston, a pocket or chamber 70, (see Fig. 8) partially formed in the rear wall of. the pocket, and partially formed in the rear face of the rotor piston. In operation, compressed air enters this chamber in the rear of the rotor piston through port 71 of the rotor and port 72 ofthe rotor piston, thus tending to ualize the pressure on 'the rotor piston.'l T

iis method of equalizing the pressure on the front and rear faces of the rotor piston constitutes another important feature of my improvement.

As clearly shown in Figs. 1 and 3 of the drawings, themember 37 is cylindrical in cross section and is formed with a hole 37 through which oil is free to pass into contact with the rotary cylinder 35 and associated parts. This cylinder 35 and associated parts, during the operation of the compressor, pick up the oil from the member 37 and throw it over the walls of this member, thus tending to reduce the level of the oil therein with the result that more oil from the housing flows through the hole 37. The drainage of oil from the member 3T back to the housing is through the cylinder bearing openings and flows copiously over the openings through the trunuions of these bearings and on to the rotor shaft passing through these openings and, due to the reduction in diameter of the shaft where rings 58 are placed, is thrown by centrifugal force into the bore of the bearing truunious and thence into the chambers in the heads 36 and into the chamber between these'heads and the ends of the rotor. The rings 58 on the shaft also tend to supply lubricating oil to said parts and to the shaft bearings 41. Thus, these moving parts, comprising the cylinder 35, which operates in the oil, are thoroughly lubricated automatically and as an incident to the operation of the compressor. Further, this oil is'sub] ected to the pressure of the compressed fluid in the housing and is caused to form a seal for the compressor to prevent leakage of the fluid into the compressor.

It will be observed from Fig. 1 that there is an unbalanced pressure area on the heads 36. This unbalanced pressure is caused by the flanges 59 of the rotor contacting with these heads on their inner faces, so that under normal operation there will always be va slightly greater pressure exerted on the heads in a direction toward the rotor, than an outward pressure. Should any sudden rise of pressure, in excess of the inward pressure, be exert-ed in the compression chamber, the floating heads will move outward land open up a gap between the heads 36 and flanges 59 and relieve the excess pressure from the compression chamber by permitting it to escape through this gap into the cylinder to the rear of the piston, and also through the central openings formed in the cylinder heads into the housing 11. As soon as this excess pressure vhas been relieved and equalized on both sides of the floating heads 36, they are then forced inward and again seal the compression chamber.

Having fully described my invention, what I claim is:

ing, a shaft concentrically mounted therein, a casing eccentrically mounted in said housing, means for yieldingly adjusting said casing, a rotating cylinder provided with ,floating heads mounted in said casing, a rotor provided with inlet and valved outlet ports eccentrically mounted in said rotating cylinder and a rotor piston mounted in said rotor in advance of the inlet ports in the rotor, the said rotor, piston, cylinder and floating heads forming a compression chamber,

the said floating heads being .held in fluid tight contact with the ends of the rotor by fluid` pressure generated by the compressor, and confined within the housing.

2. An air compressor comprising an automatically laterally adjustable rotating cylinder, floating heads mounted Wholly Within,

the cylinder and unrestrained from inward movement thereby, a rotor provided with pe.- ripheral flanges and with inlet ports and valved outlet ports eccentrically mounted within said cylinder, said `floating heads being held in fiuid tight contact with the flanges of the rotor both by spring' and by fluid pressure generated bythe compressor..

3. In a rotary air compressor, an adjustable cylinder, heads independently movable relative to -said cylinder, a rotor eccentrically mounted in said cylinder, a centrifugally operated piston blade tangentially mounted in 1. An air compressor comprising a hous I :aan

' said rotor, and a housing acting as a receiver for the air compressed by thecompresso'r surroundlng said cylinder.

4. In-a rotary air compressor, a compression cylinder having at each end a fixed and a.

floating head, a rotor eccentrically mounted therein, a rotor piston carried tangentially mounted in said rotor, a chamber formedin each end of the rotor for equalizing the pressure on the ioating heads, a chamber formed in the rear of the rotor pistonffor equalizin the pressure on the faces of said piston, an automatic means for adjusting the compression cylinder to and from the rotor.

5. Ina Arotary air compressor, a rotating compression cylinder having fixed and floatingI heads, a rotor eccentrically mounted Within said cylinder, said rotor provided in tion of said rotor, movable heads carried by said cylinder and contacting with the ends of said rotor, and elastic means for holding said heads in fluid tight contact with the ends of the rotor.

7 In a machine of the class described, the

combination of a barrel-to receive a fluid, and

having heads, a rotary drum eccentrically mounted in said barrel, a single blade guided y to slide in and out in said drum as the druln rotates, and including a pair of packing plates.

within said barrel for engaging the ends of said drum, said drum having a pressure equalizing chamber on the rear side of said blade remote from the working side of said blade, and means for maintaining communication between said equalizing chamber and the working chamber of the barrel to equalize the lateral forces exerted on the opposite sides of said blade.

8. In a rotary air compressor, a housing, a rotating cylinder mounted in said housing, floating heads for said cylinder, a rotor, an equalizing chamber between the rotor and floating heads for equalizing the pressure on said heads, a piston blade carriedby said rotor, and means for maintaining communication bet-Ween the equalizing chamber located between the rotor and floating heads and the housing. l

9. An air compressorcomprising a housing, a hollow shaft mounted therein, a rotating compression cylinder mounted 1n sald housing, floating heads for said cylinder, a`

rotor mounted in said cylinder, automatic means for adjusting said cylinder relative to said rotor, a rotor iston mounted in said rotor, and a cooling evice communicating with the compression chamber and the housing whereby the air from the compression chamber is conducted to and through the cooling device before' coming in Contact with the external wallsof the cylinder, thereby preventing the cylinder from rotating in the hot gases generated by the compressor.

1.0. In a compressor of the character'described, a casing, a rotary piston, a rotary cylinder therefor e mounted eccentrically thereto and having a portion of its inner Wall engaging a portion of the peripheral vWall of the piston, the remaining portions of said walls being spaced apart to form a compressing chamber between them, supporting members carried by the cylinder at the opposite ends thereof, and means within the cylinder and interposed between said members and the adjacent ends of the cylinder and piston and operating under a differential of gas pressure'in the casing for closing the ends of the compressing chamber and effecting gas tight joints with the ends of the piston and with the interior of the cylinder respectively. I

l1. In a compressor of the kind described, a rotary piston, a cylinder therefor mounted rotatably and eccentrically thereto and actuated thereby, terminal heads carried by the cylinder, trunnions on the heads, and a rotary wedge ring spanning the cylinder and cooperating with the trunnions for controlling the eccentricity between the rotation axes o-f the cylinder and piston.

12. In a compressor of the character described,a rotary piston, a cylinder therefor mounted rotatably and eccentrically thereto, androtated thereby, terminal heads carried by the' cylinder, trunnions on the heads, a

`drive shaft for the piston passing freely through the trunnions of the cylinder heads, bearings for the shaft and for the trunnions of the cylinder heads, and a rotary wedge ring spanning the cylinder and cooperating with the trunnions thereof for maintaining proper engagement between the cylinder and piston.

13. In a compressor of the character described, a rotary piston, a cylinder therefor mounted rotatably and eccentrically thereto and rotated thereby, terminal heads carried bythe cylinder, trunnions on the heads, a drive shaft for the piston passing freely through` the aforesaid trunnions, a casing, bearings in the casing for the support of the shaft, annular rings each provlded with a race-way for anti-friction bearing bodies supporting the trunnions of the cylinder heads, and a rotary wedge ring spanning the cylinder and surrounding the annular rings and operating to maintain proper contact beperiphery of the piston.

tween the inner wall of the cylinder and the 14. In a rotary machine, the combination of a rotary piston, a rotatable cylinder comprising a cylindrical shell engaging the face of said piston and rotated thereby, said cylinder having heads, and mounted to rotate about an axis eccentric to the axis of rotation of the piston, adjustable members constituting bearings on which said cylinderrotates,-

and means for yieldiiigly forcing said adjustable members in a direction to maintain said shell in contactv with the face of the piston. Y

15. In a rotary compressor, the combination of a casing, a rotatable p-iston, a4 rotatable cylinder having heads and a cylindrical shell engaging the face of the piston and rtated thereby,`eccentric rings mounted on said casing and supporting said cylinder .to

rotate on an axis of rotation eccentric to theJ axis of rotation of the piston, and means tending to rotatesaid eccentric rings in a direction to maintain the shell in contact with the face of the piston. Y

16. In a rotary compressor, the combination of a cvlinder mounted to rotate, a drum eccentrically mounted therein, engaging the Wall of the cylinder, said cylinder and drum cooperatingr to form a compression chamber. means for admitting a fluid to said compression chamber, floating heads rotating with the drum and cylinder, disposed against the ends of the drum and constituting the end walls of the compression chamber, said compressor having receiving chambers on the outer sides of said floating heads for receiving the fluid under pressure, the fluid pressure in said receiving chambers operating to hold the floating heads yieldinglv against the ends of the drum, whereby the Heating heads may move outwardly to relieve sudden excessive pressure within the cylinder.

17. In a rotary compressor, the combination of a cylinder mounted to rotate in a casing, a rotor eccentrically mounted therein engaging the wall of the evlinder, a shaft ex- ,tendinar concentrically through said rotor.

said cylinder and rotor cooperating to form a compression chamber. means for admitting a fluid to said compression chamber, floating' headsrotating relatively with the rotor and cylinder disposed against the ends of the ,rotor and constituting the end walls of the compression chamber. means for maintaining air under pressure against the outer faces of said floating heads for holding said heads yieldinglv. against the ends of the rotor. whereby the floating heads maymove outwardly to relieve sudden excessive pressure within the cylinder.

18. In a rotary compressor, the combination of a casing, a rotating cylinder having heads for closing the ends thereof mounted in said casing, a rotary piston eccentrically shaft extending axiall man mounted in said rotating cylinder, a rotating through saidk rotor. a piston blade mounte in said rotary piston, a pressure equalizing chamber in the rear of the blade, and means for admitting fluid ressure from the front or compression side of said blade into said equalizing chamber for equalizing the pressure on opposite sides of said blade to reduce friction tending to restrict the free movement' of said blade.

19. In a rotary compressor, the combination of a housing arranged to-hold pressure generated by the compressor, a rotating cylinder, a rotor eccentrically mounted in said rotating'- cylinder, means for rotating said rotor, a piston mounted in said rotor, said rotating cylinder and rotor being mounted in the housing` movable'heads for closing the ends of said cylinder acted on by gas pressure from said housing. l i

20. In a rotary compressor, a housing, a shaft revolvableon anti-friction bearings mounted therein, a rotor mounted on said shaft, a piston mounted in said Lrotor, a rotating cylinder provided with floating heads adjustably mounted onv anti-friction bearings within said housing, the said rotor, piston, cylinder and floating heads forming a compression chamber, an oil reservoir, a cooling device in communication with the compression chamber, means for taking the oil from the oil reservoir for disposing the oil over the-moving surfaces of the elements of the compression chamber and iii-to the same, said coolinc` device acting to condense the oil.

vapor discharged from the compressor and returning it to the oil reservoir.

21. In an air compressor, a housing arranged to receive and confine the fluid compressed under the pressure developed by the.

compressor, a -rotary compressor within said housing enveloped in said fluid, said housing containing a body of lubricating oil to/lubricate the parts thereof, said oil andv fluid under pressure foi-ming a separate oil seal at each end of the compressor to prevent leakage of the fluid under pressure into said compresser.

22. Iii a rotary air compressor, a housing, a rotor piston mounted in said housing, a

revolvablc cylinder surrounding said piston..

provided with axially movable heads for and eccentric to said piston, means for holdingl said cylinder in position with relation to said rotor so that a rolling contact between said piston and cylinder is maintained, said housing being arranged to hold compressed fluid under the pressure of the compressor for the purposes set forth.

23. In a fluid' compressor, the combination with a housing, of` a cylinder rotatably mounted'therein, a rotor piston eccentrically mounted in the cylinder, means for rotating said rotor, said cylinder and rotor piston having a rolling contact and cooperating to iis iso

in the rear of said blade, means for admitting fluid pressure into the chamber, said pressure chamber beingI formed partly in the rotor and partly inthe said piston blade Ytrically thereto, a compression chamber, a

whereby the pressure area of said blade ad-` jacent said pressure chamber is increasedas the blade moves inward-in said blade slot.

25. A rotary compressor comprising a cylinder` a rotor mounted Within and eccenhousing receiving and confining the compressed fluid under compression and containing a body of lubricating oil under the pressure ofthe compressed fluid, a one Way passage for delivering compressed fluid from the compression chamber into said housing,. said rotor having portions thereof cut away at its ends, means cooperating with said cut away portions of the rotor to form separate oil reservoirs interiorly ofthe length of said cylinder, open communications from said housing t'o said reservoirs for admitting oil thereto and for maintaining the same under the pressure of the compressed` fluid in the i housing whereby the oil in said reservoirs, together with said one Way passage, acts to prevent leakage of compressed fluid from said housing into said compression chamber.

26. A rotary compressor lcomprising a c vlinder. a rotor mounted Within and eccentrically thereto. a compression chamber intermediate said cylinder and said rotor, a housing receiving and confining the compressed fluid under compression and containing a body of lubricating oil under the pressure of the compressed fluid, a one way passage for delivering compressed fluid from the compression chamber into saidhousing, heads forming end walls for said compresq sion chamber, said heads 'and the ends of said rotor cooperating to form separate reservoirs at each end of said rotor interiorly of the length of said cylinder, open communications from said housing to said re'ser` voirs for admitting oil thereto and for maintaining the same under the pressure of the inder, a rotor mounted within and eccentrically to said cylinder for rotation therein, a

compression chamber intermediate said cylin'der and said rotor extending longitudinally of said cylinder, a reciprocable piston blade cooperating With said cylinder and said rotor to effect compression of fluid when said rotor is rotated relative to vsaid cylinder, a housing] receiving and confining the compressed fluid under compression and containing a body of lubricating oil under the pressure of thecompressed fluid confined in said housing, a one way valve means for permittingpassage of compressed fluid from said compression chamber to said housing, heads forming end Walls for said compression chamber, said heads and the ends of said rotor vcooperating to form Walls of separate annular chambers at each end of the rotor interiorly of the length of the cylinder, open communications from said housing to said lannular chambers for admitting oil thereto and for maintaining the same under the pressure of the compressed fluid in the housing whereby the oil in said annular chambers, to-

gether With said one Way valve means, acts to prevent leakage of compressed fluid from said housing into said compression chamber.

EDWARD WILSON.

compressed fluid in the housing whereby the i oil in said reservoirs, together with said one way passage acts to prevent leakage of compressed fluid from said housing into said cogipression chamber.

.. A rotary compressor comprising a cyl- 

